Photonic Quantum Networking for Large Superconducting Qubit Modules

A quantum computing network comprising:

• a plurality of quantum processing units (QPUs) each comprising a qubit device and a transducer device, the plurality of QPUs comprising:
• a first QPU comprising a first qubit device, a first transducer device, and a first pump filter configured to operate at a cryogenic temperature;
• a second QPU comprising a second qubit device, a second transducer device, and a second pump filter configured to operate at a cryogenic temperature;
• wherein each of the plurality of QPUs is configured to perform operations comprising:
• generating microwave modes and optical modes by operation of the first transducer device in response to first optical excitations;
• generating microwave modes and optical modes by operation of the second transducer device in response to second optical excitations;
• filtering, by operation of the first pump filter, a first optical output from the first transducer to remove at least a portion of the first optical excitations;
• filtering, by operation of the second pump filter, a second optical output from the second transducer to remove at least a portion of the second optical excitations;
• and
• transmitting the microwave modes within the first and second QPUs from the first and second transducer devices to the respective first and second qubit devices;
• and
• a global controller system comprising a pump laser system, a beam splitter device, and the interferometer device, the global controller configured to perform operations comprising:
• generating the first and second optical excitations by operation of the pump laser system and the beam splitter device;
• transmitting the first and second optical excitations from the beam splitter device to the respective first and second QPUs;
• by operation of the interferometer device, generating output signals on respective output channels based on the optical modes from the first and second QPUs;
• and
• based on the output signals from the interferometer device, identifying quantum entanglement transferred to the first and second qubit devices by the microwave modes.